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对“南永一井”2 2～ 5 0m间的连续方解石化珊瑚岩芯以及 1 7～ 1 8m间文石向方解石转变过程中的珊瑚样品进行了氧碳同位素和矿物组成分析 .结果显示在文石向方解石转变过程中 ,其氧碳同位素比值大体存在一种线性的降低过程 ,意味着经方解石化后珊瑚原有氧碳同位素比值的相对变化可基本保存 .根据δ18O比值划分了 2 2～ 5 0m间蚀变珊瑚岩芯的氧同位素地层 ,所得年龄与古地磁结果基本一致 ,表明方解石化的珊瑚仍一定程度上保存原先的由氧碳同位素比值相对变化所反映出来的古气候古环境信息 .
Oxygen and carbon isotope and mineral composition analysis of coral samples from continuous calcite coral cores between 22m and 50m in Nanyongyi Well and corals from calcite to calcite during 17 to 18m were carried out. During the conversion of aragonite to calcite, there is a linear decrease in the ratio of oxygen and carbon isotopes, which means that the relative changes of original oxygen and carbon isotope ratios of coral can be basically preserved after calcite treatment.According to the δ18O ratio, The results show that the calcite coral still retains to some extent the original Paleoclimatic paleoenvironmental information reflected by the relative changes of oxygen and carbon isotopic ratios .